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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#include <seastar/core/temporary_buffer.hh>
#include "include/buffer.h"
#include "common/error_code.h"
namespace details {
template<bool is_const>
class buffer_iterator_impl {
public:
using pointer = std::conditional_t<is_const, const char*, char *>;
buffer_iterator_impl(pointer first, const char* last)
: pos(first), end_ptr(last)
{}
pointer get_pos_add(size_t n) {
auto r = pos;
pos += n;
if (pos > end_ptr) {
throw buffer::end_of_buffer{};
}
return r;
}
pointer get() const {
return pos;
}
protected:
pointer pos;
const char* end_ptr;
};
} // namespace details
class seastar_buffer_iterator : details::buffer_iterator_impl<false> {
using parent = details::buffer_iterator_impl<false>;
using temporary_buffer = seastar::temporary_buffer<char>;
public:
seastar_buffer_iterator(temporary_buffer& b)
: parent(b.get_write(), b.end()), buf(b)
{}
using parent::pointer;
using parent::get_pos_add;
using parent::get;
ceph::buffer::ptr get_ptr(size_t len);
private:
// keep the reference to buf around, so it can be "shared" by get_ptr()
temporary_buffer& buf;
};
class const_seastar_buffer_iterator : details::buffer_iterator_impl<true> {
using parent = details::buffer_iterator_impl<true>;
using temporary_buffer = seastar::temporary_buffer<char>;
public:
const_seastar_buffer_iterator(temporary_buffer& b)
: parent(b.get_write(), b.end())
{}
using parent::pointer;
using parent::get_pos_add;
using parent::get;
ceph::buffer::ptr get_ptr(size_t len);
};
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